WCAG Level AAA requires a contrast ratio of at least 7:1 for normal text and 4.5:1 for large text. WCAG 2.1 requires a contrast ratio of at least 3:1 for graphics and user interface components (such as form input borders). WCAG 2.0 level AA requires a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text.
The Lightness slider can be used to adjust the selected color. Learn more about WebAIM Evaluation Services ExplanationĮnter a foreground and background color in RGB hexadecimal format (e.g., #FD3 or #F7DA39) or choose a color using the color picker. I am yet to discover a service or tool that uses some kind of fuzzy logic or artificial intelligence in order to spot and visibly highlight similarities in a "stepless" manner, for example by using some sort of heat map color highlighting of the similarities.Web accessibility testing can be difficult! The experts at WebAIM can audit your web site and provide a detailed report to help you remediate accessibility and WCAG compliance issues. However, it is a) terribly slow as compared to the other two mentioned above, b) has no multi-color coding for quick overview, c) breaks longer texts into multiple pages that you have to click through, and d) you can't quickly edit one or both of your texts and redo the comparison with the edited texts.
Also, you can click on text passages and it will highlight the respective passage in the other text. Both with Chrome and Firefox, this does not seem to work properly.Ĭ seems to be even more sophisticated since it at least tries to detect similarity also when there are small differences like for example OCR errors. Vroniplag even lets you copy the results including all the color highlighting into Word, however only if the comparison is done with Internet Explorer. I checked like a dozen online comparison tools, and the best ones (by far) still seem to be Vroniplag (great multi-color highlighting of identical textblocks including moved block detection), and wikEd diff (highly configurable, including moved block detection). Both WinMerge and Meld fail completely as soon as the texts become just a little dissimilar. Thereby, the installed tools, like the latest versions of WinMerge and Meld, proved to have no chance against the best online tools. I was just going to report that I tested some online and off-line (*.exe) diff tools again.
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